Malicious PDF — malware analysis report

Static analysis result for SHA-256 c036f9921be8827b…

MALICIOUS

PDF

76.3 KB Created: 2021-06-25 21:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f40753e00fa68ca0492510fb65b628af SHA-1: 04a330716634ed5b26de0c336a0fb98ad0408fb9 SHA-256: c036f9921be8827b1709774ad07a015cefada4976e2f31a8561d40fcf5d47188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links suggest it's designed to lure users into clicking through to malicious destinations, fitting the pattern of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1abe32a05---vigefijorotokeze.pdf In PDF document text
    • http://kirilmazbardak.com/userfiles/file/fipamerilonolebu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3sf4faeklgl7946i9uafe866m7/6126078222.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/memuwozulisepu.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/majokovifelodijazojime.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/5ec529a1f8dca09d6fde4659316c286a/fepolopudozerowugaka.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b8619ac1e10575ca290b629b162f78db/26495683793.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/88721502570.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/bc03e6227e666fd85bd02a9ad16bcd98/32438469101.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868698a6db---rabovojupevi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094745474054---nidijadegakeli.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c437e44aba---57071294430.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/68800607296.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/kanezafexisomalo.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/kvi6lfee43jhvksuvo2ilquoee/77008741440.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471141f6ee---jedunabaxasuludowama.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/juteberusosaz.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/kisovamenewokukaxaxej.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/dcgckdrv3p63d5oa6lac5bqe28/33552564730.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d08dca49---pemokakiluboxav.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc50811ef842c1225a432a97290a2cb8/jamizopawujejagatapu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xawux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+preview+default+pdf+viewerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69C 10724 bytes
SHA-256: 11c3551cf205e322e00f839f02f8b8da240278f326dc5224e9a213bcb50bf660
font_01_sfnt_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 17064 bytes
SHA-256: 4e8e48f977c97d0d3e25835376c1f3500cdf85ea9ea25202aa59504262e9f988